تغییر پسورد در لاراول

<form id="form-change-password" role="form" method="POST" action="{{ url('/user/credentials') }}" novalidate class="form-horizontal">
  <div class="col-md-9">             
    <label for="current-password" class="col-sm-4 control-label">Current Password</label>
    <div class="col-sm-8">
      <div class="form-group">
        <input type="hidden" name="_token" value="{{ csrf_token() }}"> 
        <input type="password" class="form-control" id="current-password" name="current-password" placeholder="Password">
      </div>
    </div>
    <label for="password" class="col-sm-4 control-label">New Password</label>
    <div class="col-sm-8">
      <div class="form-group">
        <input type="password" class="form-control" id="password" name="password" placeholder="Password">
      </div>
    </div>
    <label for="password_confirmation" class="col-sm-4 control-label">Re-enter Password</label>
    <div class="col-sm-8">
      <div class="form-group">
        <input type="password" class="form-control" id="password_confirmation" name="password_confirmation" placeholder="Re-enter Password">
      </div>
    </div>
  </div>
  <div class="form-group">
    <div class="col-sm-offset-5 col-sm-6">
      <button type="submit" class="btn btn-danger">Submit</button>
    </div>
  </div>
</form>

public function admin_credential_rules(array $data)
{
  $messages = [
    'current-password.required' => 'Please enter current password',
    'password.required' => 'Please enter password',
  ];

  $validator = Validator::make($data, [
    'current-password' => 'required',
    'password' => 'required|same:password',
    'password_confirmation' => 'required|same:password',     
  ], $messages);

  return $validator;
}

public function postCredentials(Request $request)
{
  if(Auth::Check())
  {
    $request_data = $request->All();
    $validator = $this->admin_credential_rules($request_data);
    if($validator->fails())
    {
      return response()->json(array('error' => $validator->getMessageBag()->toArray()), 400);
    }
    else
    {  
      $current_password = Auth::User()->password;           
      if(Hash::check($request_data['current-password'], $current_password))
      {           
        $user_id = Auth::User()->id;                       
        $obj_user = User::find($user_id);
        $obj_user->password = Hash::make($request_data['password']);;
        $obj_user->save(); 
        return "ok";
      }
      else
      {           
        $error = array('current-password' => 'Please enter correct current password');
        return response()->json(array('error' => $error), 400);   
      }
    }        
  }
  else
  {
    return redirect()->to('/');
  }    
}